overtopping

An instance of water going over the top of a barrier such as a sea wall or levee.

Around 34 miles of the Wales Route's coastal lines are vulnerable to overtopping, coastal erosion and storm surges.

Surmounting, surpassing.

And he never said a word to her against her mother – he only remained dumb and discouraged in the face of her ladyship's own overtopping earnestness.